/* ===== 黑料网今日黑料 - 样式表 ===== */

:root {
    --primary: #c62828;
    --primary-dark: #b71c1c;
    --primary-light: #ef5350;
    --accent: #ffeb3b;
    --accent-dark: #fdd835;
    --bg: #fffde7;
    --bg-warm: #fff9c4;
    --text: #212121;
    --text-light: #616161;
    --text-muted: #9e9e9e;
    --white: #ffffff;
    --border: #ffe082;
    --shadow: 0 2px 12px rgba(198, 40, 40, 0.12);
    --shadow-hover: 0 6px 24px rgba(198, 40, 40, 0.2);
    --radius: 8px;
    --radius-lg: 16px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'ZCOOL KuaiLe', 'Noto Sans SC', sans-serif;
    color: var(--primary-dark);
    font-weight: 700;
    line-height: 1.3;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 顶部公告栏 ===== */
.top-bar {
    background: var(--primary);
    color: var(--white);
    font-size: 13px;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 20px;
}

.top-bar a {
    color: var(--accent);
    margin-left: 16px;
}

/* ===== 页头导航 ===== */
.header {
    background: var(--white);
    border-bottom: 3px solid var(--primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 22px;
    font-weight: 700;
    transform: rotate(-3deg);
}

.logo-text {
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 24px;
    color: var(--primary-dark);
}

.logo-text span {
    color: var(--accent-dark);
    background: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 18px;
}

.nav {
    display: flex;
    gap: 6px;
}

.nav a {
    color: var(--text);
    padding: 8px 16px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.3s;
}

.nav a:hover,
.nav a.active {
    background: var(--primary);
    color: var(--white);
}

.nav a.active {
    position: relative;
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--primary);
    font-size: 28px;
    cursor: pointer;
}

/* ===== Banner区域 ===== */
.banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 60px 0 50px;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    opacity: 0.15;
    border-radius: 50%;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    opacity: 0.1;
    border-radius: 50%;
}

.banner-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.banner-badge {
    display: inline-block;
    background: var(--accent);
    color: var(--primary-dark);
    padding: 6px 20px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 20px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.banner h1 {
    color: var(--white);
    font-size: 48px;
    margin-bottom: 16px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.banner p {
    font-size: 18px;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto 30px;
}

.banner-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 30px;
}

.banner-stat {
    text-align: center;
}

.banner-stat .num {
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 36px;
    color: var(--accent);
    display: block;
    line-height: 1;
}

.banner-stat .label {
    font-size: 14px;
    opacity: 0.9;
}

/* ===== 通用区块 ===== */
.section {
    padding: 60px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 36px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 28px;
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 32px;
    background: linear-gradient(180deg, var(--primary), var(--accent-dark));
    border-radius: 3px;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 15px;
}

.more-link {
    color: var(--primary);
    font-weight: 500;
    font-size: 14px;
}

.more-link:hover {
    text-decoration: underline;
}

/* ===== 热度徽章 ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    margin-right: 6px;
}

.badge-hot {
    background: var(--primary);
    color: var(--white);
}

.badge-new {
    background: #4caf50;
    color: var(--white);
}

.badge-important {
    background: #ff9800;
    color: var(--white);
}

.badge-exclusive {
    background: linear-gradient(135deg, var(--primary), var(--accent-dark));
    color: var(--white);
}

.badge-rank {
    background: var(--accent);
    color: var(--primary-dark);
    border: 1px solid var(--primary);
}

/* ===== 今日热点卡片 ===== */
.hot-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.hot-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border-top: 4px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.hot-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    opacity: 0.3;
}

.hot-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.hot-card .card-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.hot-card .card-title {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 10px;
    line-height: 1.5;
}

.hot-card .card-title a {
    color: var(--text);
}

.hot-card .card-title a:hover {
    color: var(--primary);
}

.hot-card .card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

.hot-card .card-meta .heat {
    color: var(--primary);
    font-weight: 600;
}

.hot-rank {
    position: absolute;
    top: 16px;
    left: 16px;
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 18px;
    font-weight: 700;
    z-index: 2;
}

.hot-card:nth-child(1) .hot-rank { background: #d32f2f; }
.hot-card:nth-child(2) .hot-rank { background: #f57c00; }
.hot-card:nth-child(3) .hot-rank { background: #fbc02d; color: var(--text); }

/* ===== 列表页样式 ===== */
.news-list {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.news-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.news-item:last-child {
    border-bottom: none;
}

.news-item:hover {
    background: var(--bg-warm);
}

.news-item .news-img {
    width: 200px;
    height: 140px;
    object-fit: cover;
    border-radius: var(--radius);
    flex-shrink: 0;
}

.news-item .news-content {
    flex: 1;
}

.news-item .news-title {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 8px;
    line-height: 1.5;
}

.news-item .news-title a {
    color: var(--text);
}

.news-item .news-title a:hover {
    color: var(--primary);
}

.news-item .news-desc {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-item .news-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
}

.news-item .news-meta .dot {
    width: 4px;
    height: 4px;
    background: var(--text-muted);
    border-radius: 50%;
}

/* ===== 独家深度 ===== */
.exclusive-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.exclusive-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    position: relative;
}

.exclusive-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.exclusive-card .exclusive-img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.exclusive-card .exclusive-content {
    padding: 28px;
}

.exclusive-card .exclusive-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 14px;
}

.exclusive-card h3 {
    font-size: 22px;
    margin-bottom: 14px;
    color: var(--text);
}

.exclusive-card h3 a {
    color: var(--text);
}

.exclusive-card h3 a:hover {
    color: var(--primary);
}

.exclusive-card p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.exclusive-card .exclusive-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.exclusive-card .read-more {
    color: var(--primary);
    font-weight: 600;
}

/* ===== 分类导航 ===== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.category-item {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 2px solid transparent;
    cursor: pointer;
}

.category-item:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 28px;
}

.category-item:nth-child(2) .category-icon { background: linear-gradient(135deg, #ff6f00, #e65100); }
.category-item:nth-child(3) .category-icon { background: linear-gradient(135deg, #6a1b9a, #4a148c); }
.category-item:nth-child(4) .category-icon { background: linear-gradient(135deg, #00695c, #004d40); }

.category-item h4 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text);
}

.category-item p {
    color: var(--text-light);
    font-size: 13px;
}

/* ===== 时间轴 ===== */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--accent-dark));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-bottom: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -30px;
    top: 8px;
    width: 18px;
    height: 18px;
    background: var(--white);
    border: 3px solid var(--primary);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item .time {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
}

.timeline-item .timeline-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 16px 20px;
    box-shadow: var(--shadow);
}

.timeline-item .timeline-content h4 {
    font-size: 16px;
    color: var(--text);
    margin-bottom: 6px;
}

.timeline-item .timeline-content p {
    color: var(--text-light);
    font-size: 14px;
    margin: 0;
}

/* ===== 标签云 ===== */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 30px;
    font-size: 13px;
    color: var(--text-light);
    transition: all 0.3s;
    cursor: pointer;
}

.tag:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.tag.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* ===== 侧边栏 ===== */
.sidebar {
    width: 300px;
    flex-shrink: 0;
}

.sidebar-widget {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.sidebar-widget h3 {
    font-size: 18px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.sidebar-widget li {
    padding: 10px 0;
    border-bottom: 1px dashed var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-widget li:last-child {
    border-bottom: none;
}

.sidebar-widget li a {
    color: var(--text);
    font-size: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sidebar-widget li a:hover {
    color: var(--primary);
}

.sidebar-widget li .rank-num {
    width: 22px;
    height: 22px;
    background: var(--bg);
    color: var(--text-muted);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.sidebar-widget li:nth-child(1) .rank-num { background: #d32f2f; color: var(--white); }
.sidebar-widget li:nth-child(2) .rank-num { background: #f57c00; color: var(--white); }
.sidebar-widget li:nth-child(3) .rank-num { background: #fbc02d; color: var(--text); }

/* ===== 关于页面 ===== */
.about-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.about-hero h1 {
    color: var(--white);
    font-size: 42px;
    margin-bottom: 16px;
}

.about-hero p {
    font-size: 18px;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
}

.content-wrap {
    display: flex;
    gap: 30px;
}

.main-content {
    flex: 1;
}

.about-section {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.about-section h2 {
    font-size: 26px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-section h2::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 28px;
    background: var(--primary);
    border-radius: 3px;
}

.about-section p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 16px;
    text-align: justify;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 20px;
}

.team-card {
    text-align: center;
    padding: 24px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.team-card:hover {
    background: var(--bg-warm);
    transform: translateY(-4px);
}

.team-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 32px;
}

.team-card h4 {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 6px;
}

.team-card .role {
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
}

.team-card p {
    color: var(--text-light);
    font-size: 13px;
    margin: 0;
}

/* ===== 联系页面 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.contact-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow);
    text-align: center;
}

.contact-card .contact-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.contact-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-light);
    margin-bottom: 8px;
}

.contact-card .contact-detail {
    color: var(--primary);
    font-size: 20px;
    font-weight: 700;
    margin: 12px 0;
}

.disclaimer {
    background: var(--bg-warm);
    border-left: 4px solid var(--primary);
    padding: 24px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-top: 30px;
}

.disclaimer h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.disclaimer p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
}

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(180deg, #212121 0%, #424242 100%);
    color: var(--white);
    padding: 60px 0 0;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    padding-bottom: 40px;
}

.footer-col h4 {
    color: var(--accent);
    font-size: 18px;
    margin-bottom: 20px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    color: rgba(255,255,255,0.75);
    font-size: 14px;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-col p {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 12px;
}

.footer-col .footer-logo {
    font-family: 'ZCOOL KuaiLe', sans-serif;
    font-size: 26px;
    color: var(--white);
    margin-bottom: 16px;
    display: block;
}

.footer-col .footer-logo span {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding: 20px 0;
    text-align: center;
    color: rgba(255,255,255,0.6);
    font-size: 13px;
}

.footer-bottom a {
    color: rgba(255,255,255,0.8);
    margin: 0 8px;
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    border-radius: var(--radius);
    background: var(--white);
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.pagination a:hover,
.pagination .current {
    background: var(--primary);
    color: var(--white);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hot-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .exclusive-grid {
        grid-template-columns: 1fr;
    }
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        border-bottom: 3px solid var(--primary);
        box-shadow: var(--shadow);
    }
    .nav.open {
        display: flex;
    }
    .nav-toggle {
        display: block;
    }
    .banner h1 {
        font-size: 32px;
    }
    .banner p {
        font-size: 15px;
    }
    .banner-stats {
        gap: 20px;
    }
    .banner-stat .num {
        font-size: 26px;
    }
    .hot-grid {
        grid-template-columns: 1fr;
    }
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .content-wrap {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
    }
    .news-item {
        flex-direction: column;
    }
    .news-item .news-img {
        width: 100%;
        height: 180px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .team-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    .section {
        padding: 40px 0;
    }
    .section-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    .banner h1 {
        font-size: 26px;
    }
    .banner-stats {
        flex-direction: column;
        gap: 15px;
    }
    .category-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .logo-text {
        font-size: 18px;
    }
    .logo-text span {
        font-size: 14px;
    }
    .section-title {
        font-size: 22px;
    }
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-hover);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    font-size: 20px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}